[1] Leeds Inst Mol Med, Epidemiol & Biostat Sect, Leeds, W Yorkshire, England
[2] Univ Sydney, Sch Publ Hlth, Sydney, NSW 2006, Australia
[3] Kings Coll London, Twin Res & Genet Epidemiol Unit, London WC2R 2LS, England
[4] Hemel Hempstead Gen Hosp, Dept Dermatol, W Herts NHS Trust, Hemel Hempstead, Herts, England
[5] Leiden Univ, Dept Dermatol, Med Ctr, Leiden, Netherlands
[6] Univ New Mexico, Dept Internal Med, Albuquerque, NM 87131 USA
[7] Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA 94143 USA
[8] British Columbia Canc Agcy, Canc Control Res Program, Vancouver, BC V5Z 4E6, Canada
[9] Dartmouth Hitchcock Med Ctr, Dept Med, Lebanon, NH 03766 USA
[10] PO Royal Melbourne Hosp, Queensland Inst Med Res, Brisbane, Qld, Australia
[11] Univ Lund Hosp, Dept Surg, S-22185 Lund, Sweden
[12] Univ Penn, Dept Biostat & Epidemiol, Philadelphia, PA 19104 USA
[13] Univ Penn, Ctr Clin Epidemiol & Biostat, Philadelphia, PA 19104 USA
[14] Dartmouth Med Sch, Dept Community & Family Med, Lebanon, NH USA
[15] Norris Cotton Canc Ctr, Lebanon, NH USA
[16] Univ Hawaii, Canc Res Ctr Hawaii, Honolulu, HI 96813 USA
[17] Univ Glasgow, Dept Publ Hlth & Hlth Policy, Fac Med, Glasgow G12 8QQ, Lanark, Scotland
[18] Univ Lund Hosp, Dept Oncol, S-22185 Lund, Sweden
[19] Barts & London Queen Marys Sch Med & Dent, Wolfson Inst Prevent Med, London, England
[20] Inst Canc Res, Epidemiol Sect, Sutton, Surrey, England
[21] Dartmouth Med Sch, Dept Pediat, Lebanon, NH USA